dba_exists
(PHP 4, PHP 5, PHP 7)
dba_exists — Check whether key exists
Описание
bool dba_exists
( string
$key
, resource $handle
)
dba_exists() checks whether the specified
key exists in the database.
Список параметров
-
key -
The key the check is performed for.
-
handle -
The database handler, returned by dba_open() or dba_popen().
Возвращаемые значения
Returns TRUE if the key exists, FALSE otherwise.
Смотрите также
- dba_delete() - Delete DBA entry specified by key
- dba_fetch() - Fetch data specified by key
- dba_insert() - Insert entry
- dba_replace() - Replace or insert entry
Коментарии
<?php
$index = 4;
$id = dba_open("frenzy.db", "w", "flatfile");
if(!$id) exit ("Some error...");
if(dba_exists($index, $id)) exit ("This key is using");
dba_close($id);
?>